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* 2650 - Round spring actuated (6) damper for vertical or horizontal mount
12" and 14") * HVD OR - factory installed opposed radial damper (sizes 6"-14") * HVD FR - U
1 1/2 hour fire resistance rating
Face set in an outer T-Bar filter grille frame
SD52 - Transition Box Spiral Pipe Grille (Single Deflection)
Parallel Volume Damper Low Leak 3000PLL-66X56 past 12 months * 2650 - Round springh3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3. Options * 3000 PLL Low Leak Air Control
